Dumasia yunnanensis Y. T. Wei & S. K. Lee (1985: 159)

Jiang, Kai-Wen, Corlett, Richard T., Tian, Bin & Pan, Bo, 2021, Taxonomic notes on the genus Dumasia (Fabaceae), Phytotaxa 522 (2), pp. 109-120 : 113

3. Dumasia yunnanensis Y. T. Wei & S. K. Lee (1985: 159) . Fig. 2 & Fig 4A .

Type:— CHINA. Yunnan: Kunming, 9 th November 1938, H. K. Teng 171 (holotype KUN). Yunnan: Kunming , Xishan, Qiongzhusi, in open thickets, 4 th October 1946, K. M . Feng 10401 (paratype KUN!). Yunnan: Sung-ming , Kuo-Tung, alt. 2200 m, on slopes, 24 th August 1958, B. Y . Qiu 54981 (paratype PE!). Yunnan: Sung-ming , Kuo-Tung, alt. 2200 m, in thickets, 10 th October 1950, P. I . Mao 156 (paratype KUN!). Sichuan: Huili County, Beimashe , alt. 2550 m, at roadside, 3 rd October 1958, C . Ho 11544 (paratype SM!) .

Description: —Perennial twinning herbs, 1‒6 m, old plants with a semi-woody rootstock. Stem slender, sparsely pubescent. Leaves trifoliolate; stipules small, 1‒2 mm, ovate to lanceolate, longitudinal striate, persistent; petioles 1‒9 cm, glabrous to sparsely pubescent; leaflets membranous, elliptic ovate, terminal one 1‒5 × 0.6‒3 cm, lateral ones smaller and oblique, sparsely pubescent on both surfaces, apex obtuse, sub-rounded or retuse, mucronate, base rounded, broadly cuneate or nearly truncate; stipels small, setaceous; petiolules 2 mm. Pseudoracemes axillary, usually shorter than the petioles of their subtending leaves, 1‒4 cm; peduncles short; bracts and bracteoles setaceous, small. Pedicels 1‒2 mm. Calyx tubular, obliquely truncate at the mouth part, 9 mm, sparsely pubescent. Corolla yellow, 15‒18 mm, petals subequal in length; standard obovate; wings elliptic, keels with long basal claws. Pods linear to subfalcate, laterally compressed and slightly curved, 3‒5 cm × 4‒6 mm. Seeds brownish black, ellipsoid, laterally compressed.

Distribution and habitat: — Dumasia yunnanensis is distributed in Bhutan, China (Sichuan, Tibet and Yunnan), India, and Nepal, and perhaps also in Myanmar. It grows in forests, roadsides, hillslopes, and thickets, at elevations between 800–2500 m above sea level.

Phenology: —Flowering from September to October; fruiting from November to December.

Iconography citation: — Wei & Lee (1985: 160): figure 2.

Conservation status: —According to IUCN Categories (2019), Dumasia yunnanensis was considered as Least Concern (LC).

Notes: — Dumasia yunnanensis is here re-circumscribed. It is distributed north of the Tanaka Line. It is similar to D. kurziana (see the treatment below) morphologically, but D. yunnanensis bears pseudoracemes usually shorter than the petioles of their subtending leaves (vs. pseudoracemes usually longer than their subtending leaves in D. kurziana ). The differences in length of inflorescences may help to distinguish the two species. The two species had been confused for a long time, but the molecular phylogeny showed that they are distinct species ( Jiang et al., 2020).

One variety of D. yunnanensis , viz. Dumasia yunnanensis var. arunachalensis (S. V. Pradeep & M. P. Nayar) B. Pan bis & X. Y. Zhu (2010: 252) was recognized by Pan & Zhu (2010). This variety is currently only known from the type specimens, and differs from D. yunnanensis var. yunnanensis only by its ciliate leaflets. Its distribution area is more in line with D. yunnanensis re-circumscribed here, however, in the plate provided by Pradeep & Nayar (1991), the inflorescences are longer than petioles of their subtending leaves. The status of this variety needs further assessment. Here we retain its status as a variety of D. yunnanensis temporarily, since there is no more available material for further research.

Specimens examined:— CHINA. Sichuan: Huili, Beimashe , roadside, near cropland, alt. 2550 m, 3 rd October 1958, Z. He, S. G. Tang & B. Q. Li 11544 (SM). Huili, 1932, T. T. Yü 1621 (PE). Xichang, Huili, near Yimen , hill slopes, 7 th October 1958, Anonymous 11644 (SM). Zhaojue , Fucheng District , Chengxi , alt. 2130 m, 17 th September 1979, Zhaojue Exped. 0986 (SM). Tibet: Dirang Dzong, Tsangpo Valley , alt. 5000–6000 ft, 13 th October 1935, F. Kingdon Ward 12424 (BM). Yunnan: Chengjiang, Yanglangcun, roadside, alt. 1800 m, 28 th August 1939, X. Wang 47137 (IBSC). Dayao , Tanhua , in the vicinity of Yangchishuiqing village , roadside, mixed forest margin, alt. 2324 m, 23 rd September 2015, J. Cai & S. F. Qin 15 CS11352 (KUN). Kunming, Xishan, Taihuasi , in sparse forest, moist slopes, 22 nd September 1955, Anonymous 51063 (KUN, PE). Kunming , Qiongzhusi , in forest, 1 st September 1984, H. Ohashi 1647 (KUN). ibid., alt. 1900 m, 20 th August 1985, Anonymous 85-56 (PE). ibid., alt. 2000 m, 23 rd October 1978, A. J. Li 7858 (PE). ibid., 8 th October 2006, B. Pan 200609018 (PE). ibid., 10 th October 2020, K. W. Jiang, H. Y. Wu, H. Z. Feng, Z. Kang et al. JTZ01 (NPH). ibid., alt. 2200 m, 25 th November 1945, T. N. Liou 14532 (PE). Kunming, Kunming Institute of Zoology , 10 th September 1986, H. S. Men & X. C. Zhang s. n. (PE). Luquan, Erqu, Zhongping , Cilishan , under dense forest, moist places, alt. 2500 m, 14 th November 1952, P. I. Mao 1770 (PE). Luquan, Sayingpan, Sayongshan , in thickets, under forest, 28 th October 2006, B. Pan 200609035 (PE). Luquan, Sayingpan, Anonymous s.n. (PYU). Luquan , Sayongshan , alt. 2500 m, 10 th October 1964, Anonymous s. n. (PYU). Shuangbai , Tuodian , Chayeqing , in valley, 5 th October 1958, S. Q. Huang 198 (KUN). Songming, Guodong , hill slopes, 24 th August 1957, B. Y. Qiu 54981 (PE). ibid., alt. 2200 m, 10 th October 1950, P. I. Mao 156 (KUN, PE). Wuding, Shishan, under Castanopsis orthacantha forest, moist places, alt. 2200 m, 15 th October 1960, Anonymous 60-162 (KUN). Wuding, Shizishan, Anonymous s. n. (PYU). Heqing , Lianping , Fengchuiling , in forest 2 nd August 1929, R. C. Ching 23825 ( PE). ibid., in valley, mixed woods, 10 th August 1929, R. C. Ching 23622 ( KUN, PE). Dali , September 1929, Anonymous 28092 ( PE). Without locality or date: T. T. Yü 17873 ( PE). Kunming Station 51063 ( PE). Kunming Institute of Botany, the Chinese Academy of Sciences 596211 ( PE) . NEPAL. W Nepal, H . Flatt 105 ( BM) .

Figures

FIGURE 2. Dumasia yunnanensis Y. T. Wei & S. K. Lee A & D. J. Cai & S. F. Qin 15CS11352 (KUN) from Dayao, Yunnan; B & E. Anonymous 51063 (KUN) from Kunming,Yunnan; C & F. R. C. Ching 23622 (KUN) from Heqing, Yunnan. D, E & F showing the shorter inflorescences compared to the petioles of the subtending leaves. Scale bar = 1 cm. © Herbarium, Kunming Institute of Botany, CAS.

FIGURE 4. Flower dissections of Dumasia yunnanensis Y. T. Wei & S. K. Lee (A) and D. kurziana (Predeep & M. P. Nayar) B. Pan bis, B. Tian & K. W. Jiang (B). (fl) Mature flower; (c) Calyx; (a) anthers; (g) gynoecium; (st) Standard; (wg) Wings; (k) Keels. Scale bar = 1 cm. A by Kai-Wen Jiang, B by Qin Tian.